Heat-deformation-resistant exhaust device

Abstract

The utility model discloses a heat-deformation-resistant exhaust device which is used for improving the faults of heat deformation of an exhaust pipe and bolt axial force attenuation of the exhaust pipe and reducing the air leakage fault rate of an exhaust system. The device comprises an exhaust pipe body, the exhaust pipe body is provided with a first connecting-in pipe set and a second connecting-in pipe set, the number of connecting-in pipelines of the first connecting-in pipe set is equal to that of connecting-in pipelines of the second connecting-in pipe set, and bolt nail passing holes are formed in the two sides of an input port of the first connecting-in pipe set and the two sides of an input port of the second connecting-in pipe set; the bolt nail passing hole is a long kidney-shaped hole. The first access pipe set and the second access pipe set exhaust internal gas out of the exhaust pipe body through the exhaust end, the exhaust end is arranged on the side, close to the first access pipe set, of the exhaust pipe body, and a flange connecting piece is arranged at an air outlet of the exhaust end. The flange connecting piece extends from the side face of the exhaust pipe body to the outer side through a pipeline of the exhaust end.

Description

Technical Field

[0001] This application relates to the field of engines, and more particularly to an exhaust device resistant to thermal deformation. Background Technology

[0002] The engine exhaust pipe is an important component of the engine exhaust system. Its function is to expel the exhaust gases produced after engine combustion, reduce internal engine pressure, and simultaneously reduce exhaust noise and environmental pollution through the muffler. The exhaust pipe is connected to the engine cylinder block, collecting the exhaust gases from each cylinder and directing them into the main exhaust pipe; it is a branching pipe.

[0003] In current technology, engine exhaust pipes typically employ a single-piece design. This design is susceptible to leaks due to thermal deformation and reduced torque on the exhaust pipe bolts caused by increased engine operating temperatures. Under high-load conditions such as climbing hills, significant thermal deformation at both ends of the exhaust pipe can cause the bolt holes and studs to become stuck, making disassembly difficult. Furthermore, the bolt preload decreases due to cyclic loading from high and low temperatures, leading to leaks between the exhaust pipe and the flange. Additionally, the exhaust pipe interface gasket may deform and thin due to high-temperature erosion, resulting in leaks at the exhaust pipe interface. Utility Model Content

[0004] To address the aforementioned technical problems, this application provides a heat-resistant exhaust device to improve the thermal deformation of the exhaust pipe and the axial force attenuation of the exhaust pipe bolts, thereby reducing the leakage failure rate of the exhaust system.

[0005] The technical solution provided in this application is described below:

[0006] This application provides a heat-resistant exhaust device, comprising:

[0007] The exhaust pipe body is provided with a first inlet pipe group and a second inlet pipe group respectively. The number of inlet pipes in the first inlet pipe group is equal to the number of inlet pipes in the second inlet pipe group. Bolt through holes are provided on both sides of the inlet of the first inlet pipe group and the second inlet pipe group. The bolt through holes are elongated holes.

[0008] The first inlet pipe group and the second inlet pipe group discharge internal gas to the exhaust pipe body through the exhaust end. The exhaust end is located on the side of the exhaust pipe body close to the first inlet pipe group. A flange connector is provided at the outlet of the exhaust end. The flange connector extends outward from the side of the exhaust pipe body through the pipe of the exhaust end.

[0009] Optionally, the bolt through-hole is provided with multiple thickness dimensions centered on the flange connector and based on the distance from the flange connector, and the thickness dimensions decrease sequentially from the closer to the flange connector outwards.

[0010] Optionally, the thickness of the bolt hole is inversely proportional to the distance from the bolt hole to the exhaust end.

[0011] Optionally, the exhaust pipe body is connected to the engine body through the bolt hole and the exhaust pipe bolt.

[0012] Optionally, the exhaust pipe bolt top is provided with a bolt sleeve.

[0013] Optionally, the exhaust end is provided with a first exhaust port and a second exhaust port, the first exhaust port is used to exhaust the internal gas of the first access pipe group, and the second exhaust port is used to exhaust the internal gas of the second access pipe group.

[0014] Optionally, the wall thickness of the exhaust pipe body is thickened according to the distribution state of the heat load, and the higher the heat load, the thicker the wall thickness of the exhaust pipe body.

[0015] Optionally, the bolt hole is arranged in a direction converging towards the exhaust end.

[0016] Optionally, the first access pipe group and the second access pipe group are not connected to the internal pipeline.

[0017] Optionally, the flange connector is moved outward from the pipe body of the exhaust pipe body by thickening the space ratio to increase the distance between the flange connector and the exhaust pipe body.

[0018] From the above technical solutions, the present application has the following advantages:

[0019] The bolt hole is provided as a long waist hole, the pre-deformation design of the bolt hole is used to reduce the influence of the deformation of the bolt hole caused by the working temperature of the exhaust pipe body when the bolt hole is connected with the bolt, and the flange connector is extended away from the exhaust pipe body, so that the influence of the temperature rise of the exhaust pipe body on the flange connector and the flange connection tightness is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the present application, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0021] Figure 1 is a structural diagram of the anti-thermal deformation exhaust device in the present application;

[0022] Figure 2 is a top view of the anti-thermal deformation exhaust device in the present application;

[0023] Figure 3 Figure 1 is a side view of the anti-thermal deformation exhaust device in the present application;

[0024] Figure 4 Figure 2 is a thermal distribution diagram of the anti-thermal deformation exhaust device in the present application;

[0025] Figure 5 Figure 3 is a sectional view of the intersection of the first access pipe group and the second access pipe group in the anti-thermal deformation exhaust device in the present application;

[0026] Figure 6 Figure 4 is a structural schematic diagram of the bolt sleeve in the anti-thermal deformation exhaust device in the present application. DETAILED DESCRIPTION

[0027] The technical solutions in the present application will be described clearly and completely in the present application combined with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0028] Please refer to Figures 1 to 6 The present application first provides an embodiment of an anti-thermal deformation exhaust device, which comprises:

[0029] An exhaust pipe body 1 is provided with a first access pipe group 2 and a second access pipe group 3, respectively. The number of access pipes of the first access pipe group 2 is equal to the number of access pipes of the second access pipe group 3. Bolt through holes 4 are arranged on both sides of the input port of the first access pipe group 2 and the second access pipe group 3. The bolt through holes 4 are long waist holes.

[0030] The first access pipe group 2 and the second access pipe group 3 discharge internal gas out of the exhaust pipe body 1 through an exhaust end 5. The exhaust end 5 is arranged on the side of the exhaust pipe body 1 close to the first access pipe group 2. A flange connecting piece 51 is arranged at the gas outlet of the exhaust end 5. The flange connecting piece 51 extends from the side of the exhaust pipe body 1 to the outside through the pipeline of the exhaust end 5.

[0031] The exhaust pipe body 1 is the core part of the exhaust device, which is respectively provided with the first access pipe group 2 and the second access pipe group 3. The function of the two access pipe groups is to introduce the exhaust gas of the engine into the interior of the exhaust pipe body, respectively.

[0032] In this embodiment, the first access pipe group 2 and the second access pipe group 3 are respectively distributed with three air inlets, and the output end of the exhaust pipe body 1 is arranged on one side of the first access pipe group 2, and the internal pipelines of the output pipelines of the first access pipe group 2 and the second access pipe group 3 are not connected, so that the design avoids the impact of the discharged gas, and further influences the engine exhaust.

[0033] The flange connector 51 is used for connecting the flange, and if the sealing element on the flange connector 51 does not meet the requirements or the sealing surface is damaged, the external medium will seep into the inside through the gap of the flange connection, causing leakage, which will cause safety hazards and pollute the environment. Therefore, in order to avoid the failure of the flange, the output end 5 is extended to the outside, and the flange connector 51 is thickened to increase the actual distance between the flange and the exhaust pipe body, thereby reducing the influence of the working temperature change of the exhaust pipe body 1 on the flange.

[0034] In this embodiment, the bolt through hole 4 has multiple thickness sizes according to the distance from the flange connector 51, and the thickness sizes decrease from the side close to the flange connector 51 to the outside.

[0035] In this embodiment, the thickness size of the bolt through hole 4 is inversely proportional to the distance from the bolt through hole 4 to the exhaust end 5.

[0036] The internal thickness size of the bolt through hole 4 far from the flange connector 51 is greater than the external thickness size, which helps to improve the strength and deformation resistance of the connection. The thickness of the bolt through hole 4 is inversely proportional to the distance to the exhaust end 5, which means that the closer to the exhaust end 5, the greater the thickness of the bolt through hole 4, to adapt to higher thermal load.

[0037] The bolt through hole 4 has multiple thickness sizes according to the preset distance, and the sizes decrease from the side close to the flange connector 51 to the side far from the flange connector 51, to adapt to different thermal loads.

[0038] In this embodiment, the exhaust pipe body 1 is connected with the engine body through the exhaust pipe bolt 6 cooperating with the bolt through hole 4.

[0039] In this embodiment, the exhaust pipe bolt 6 is provided with a bolt sleeve 61 at the top.

[0040] The exhaust pipe body 1 is connected with the engine body through the exhaust pipe bolt 6 cooperating with the bolt through hole 4. The exhaust pipe bolt 6 is provided with a bolt sleeve 61 at the top, which helps to reduce the influence of high temperature on the axial force of the exhaust pipe bolt 6.

[0041] In the embodiment, the exhaust end 5 is provided with a first exhaust port 52 for exhausting the internal gas of the first access pipe group 2 and a second exhaust port 53 for exhausting the internal gas of the second access pipe group 3.

[0042] In the embodiment, the wall thickness of the exhaust pipe body 1 is thickened according to the distribution state of the heat load, and the higher the heat load is, the thicker the wall thickness of the exhaust pipe body 1 is.

[0043] In the embodiment, the arrangement direction of the bolt through hole 4 is gathered towards the exhaust end.

[0044] In the embodiment, the first access pipe group 2 and the second access pipe group 3 are not connected internally.

[0045] In the embodiment, the flange connector 51 is moved outward from the pipe body of the exhaust pipe body 1 by increasing the space ratio to increase the distance between the flange connector 51 and the exhaust pipe body 1.

[0046] Specifically, the two ends of the exhaust pipe body 1 are large in thermal deformation. In the application, the bolt through holes at the input ports of the first access pipe group 2 and the second access pipe group 3 are designed as long waist holes, and the long waist holes are close to the middle of the exhaust pipe body in the horizontal direction, and the bolt through holes are sequentially small with the exhaust end as the center. The size of the bolt through hole is sequentially reduced by 14, 13, 10.5 mm per unit length, and then the exhaust pipe body is pre-deformed. At the same time, the thickness of the flange connector is increased to move the pipe body of the exhaust pipe body outward, and then the distance from the flange connector is increased to improve the influence of the deformation of the pipe body on the flange sealing surface. In addition, the exhaust pipe body is designed with different wall thicknesses, the wall thickness is increased in places with high heat load, and the anti-deformation ability is improved. When the exhaust pipe body is fixed on the engine body, the bolt sleeve 61 is added to the exhaust pipe bolt 6 to reduce the axial force attenuation of the exhaust pipe bolt 6 caused by high temperature.

[0047] The bolt through hole 4 is designed as a long waist hole to reduce the influence of the deformation of the bolt through hole 4 and the exhaust pipe body 1 caused by the working temperature of the exhaust pipe body 1 when the bolt through hole 4 is connected with the exhaust pipe bolt 6. At the same time, the flange connector 51 is extended away from the exhaust pipe body 1 to reduce the influence of the temperature rise of the exhaust pipe body 1 on the tightness of the flange connector 51 and the flange connection.

[0048] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system, device and unit described above can refer to the corresponding process in the foregoing device embodiment, which will not be repeated here.

Claims

1. A heat distortion resistant exhaust device characterized by, The device comprises: An exhaust pipe body, which is respectively provided with a first access pipe group and a second access pipe group, the number of access pipes of the first access pipe group is equal to the number of access pipes of the second access pipe group, bolt through holes are arranged on both sides of the input port of the first access pipe group and the second access pipe group, and the bolt through holes are long waist holes; The first access pipe group and the second access pipe group discharge internal gas from the exhaust pipe body through an exhaust end, the exhaust end is arranged on the side of the exhaust pipe body close to the first access pipe group, a flange connector is arranged at the gas outlet of the exhaust end, and the flange connector extends outward from the side of the exhaust pipe body through the pipeline of the exhaust end.

2. The apparatus of claim 1, wherein, The bolt through holes are arranged with multiple thickness sizes according to the distance from the flange connector, and the thickness sizes decrease in turn from the side close to the flange connector to the outer side.

3. The apparatus of claim 2, wherein, The thickness size of the bolt through hole is inversely proportional to the distance from the bolt through hole to the exhaust end.

4. The apparatus of claim 1, wherein, The exhaust pipe body is connected with an engine body through the bolt through hole and an exhaust pipe bolt.

5. The apparatus of claim 4, wherein, A bolt sleeve is arranged at the top of the exhaust pipe bolt.

6. The apparatus of any one of claims 1 to 5, wherein, The exhaust end is provided with a first exhaust port and a second exhaust port, the first exhaust port is used for discharging internal gas of the first access pipe group, and the second exhaust port is used for discharging internal gas of the second access pipe group.

7. The apparatus of any one of claims 1 to 5, wherein, The wall thickness of the exhaust pipe body is thickened according to the distribution state of the heat load, and the higher the heat load is, the thicker the wall thickness of the exhaust pipe body is.

8. The apparatus of any one of claims 1 to 5, wherein, The arrangement direction of the bolt through hole is gathered to the exhaust end.

9. The apparatus of any one of claims 1 to 5, wherein, The internal pipelines of the first access pipe group and the second access pipe group are not connected.

10. The apparatus of any one of claims 1 to 5, wherein, The flange connector is moved outward from the pipe body of the exhaust pipe body by increasing the space ratio to increase the distance between the flange connector and the exhaust pipe body.

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